Automatic damper.



A. W. ARNOLD.

AUTOMATIC DAMPER.

APPLIoATIoN FILED SEPT. u, 190s.

Patented Sept. 20, 1910.

UNTTED STATES PATENT OFFICE.

ARTHUR W. AR'NOLD, 0F PORTLAND, OREGON, ASSIGNOR TO SAFETY AND ECONOMYDAMPER COMPANY, OF PORTLAND, OREGON, A CORPORATION OF OREGON. i

AUTOMATIC IDAIMPEB.y

Specification of Letters Patent. i l Application led September 8 190,8.Serial No. 452,063.

Patented l Totali whom it may concem:

a citizen ofthe United States Be it known that I, ARTHUR W. ARNOLD,residing at Portland, county of Multnomah, and State of Oregon, (whoseaddress is 423 Sherlock Building,) have invented a new and usefulAutomatlc Damper, ofvwhich the following is a specification.

' It is a well known physicallaw that heated gases or vapors rise, orhave tendency to rise, the velocity with which they .rise being directlyproportional to the degree of heat contained therein.- This 'is esypecially true in flues, pipes, or ychimneys leading from heated furnacesand great difficult has'been experienced in regulating the e ree of heatgenerated in such furnaces ecause the hotter they become, the greater is.the tendency for the gases to escape and, therefore, the 'greater thesuction or draft roduced in such flues, ipes, or

' I chimneys eading therefrom and, t1erefore, the greater thecombustion. To utilize the force of the rise of these gases inregulating such draft is one purpose of this invention, because theforce generated varies in accordance with the velocity. Under varyinconditions more or less force is enerate withinthe flue, due to theupwar assage of the heated fiuids and, therefore, a amper to meet thesevarying conditions should be so made that it may be readily adjusted andyet be simpleof construction. I attainthese objects by the mechanismsillustrated in the accompanying drawings, in which-y Figure 1 is theside elevation of the pipe or flue, parts being broken away to show thedamper in place. The full lines in Fig. 1

Vshow the damper in normal inoperative position while t e dotted linesshow the two blades partially extended, thus lessenmg the effective areaof the iiue for the passage of 'the gases and, therefore', the draftupon the furnace. Fiv. 2 is a vertical sectional view of the flue tilrenat right an les to the v1ew vof Fig. 1, and showing the amper andoperating devices in side elevation. Fig. 3 is a 1. is a joint of theflue above the place of the lnsertion of the damper.

sept. 2o, 1910.

2 is thejoint below while 3 isa sleeve into which the damper is placed,passing through 1t on opposite sides.

It will be understood that the tlue joints and sleeve 3 will be of anysuitable construct1on and cross sectional form, but this invention isdesigned especially for application to ordinary domestic stove plpes. lThe damper mechanism below described, will preferably be assembled inplace in the sleeve 3 at the factory, and thus placed on the market as acomplete article of manufacture, ready to be inserted betweenany twostove ipe joints as indicated, by any per` son w ether skil ed orunskilled.

It is to be understood that while a sleeve is shown .as bearing theother portions of the damper the sleeve as a separate element is notabsolptely required, since the damper blades and the coperating part-smay be fitted to an ordinary stove pi e or flue, especially when thedevices are eing made in connection with the Hue pipes at the factory.It is to be understood in this connection that applicant does not desireto be limited to a construction in which a sleeve as a separate elementis employed.

Parts 1 and 2 do not touch each other;.the'

space between them being somewhat greater than the rolled art whlchforms the support or axis of t 1e damper blade.

4. is one damper blade which in form sublstantially conforms to the'form of the in-y ner wall of the flue. 5 is the other damper blade. Thetwo, when extended into a hori Zontal plane, completely sto the assageof the gases. Tooperate bla e 4 t ere 1s an arm 6 and to operate blade 5there is an arm 7, both of which are parts of blades 4 and 5.

8 are small circular holes in arms 6 and 7 which are for the purpose ofallowing coni necting links 9 and 10 to be engaged therein.

11 is a counter weight. As the conditions vary, duerto a strong wind-orchange in atmospheric conditions, more or less weight is rooI requiredto operate the dam er successfully. i This is attained b 'variab yinserting the connecting links w ich support the counter weight in thesevarious openings.

When the damper blade has been formed from the blank into the finishedblade there los will be formed bearings 16 and 17 for cny l. In anautomatic damper, a pair of damper blades.

' BEST VILBLE COPY gageinent `with the sleeve, and at any snitablepoints there may be provided thrust lugs to prevent endwise movement ofthe saine, suoli being shown herein as comprising a lug l?) to engage'the inner Wall of the lue and a cooperating lug l2 to engage the outerWall of the sleeve, thus holding the blade in position in the sleevewhen once it is placed therein and made secure, as indicated. To ,keep'them from passing through more than ninety degrees, two arins le and l5come in Contact with each other. The damper blades being stainped fromsheet metal, the stop arms l-t andl vare iexible, whereby they may bereadily bent toward and from each other 'to vary the degree of angularmovement which they will permit the blades to make, according to variousre. quireinents.

operating levers connected to said blades and extending above. the axesi thereof in directions opiiosite freni the direc tions in which theblades extend, and a counterweiq'ht Connected to both of said lee versto govern the rotation of the blades on their axes. e i

2, ln an automatic damper, a plurality of damper blades, operating'levers Connected tov said blades and elitending i'roni the axes tiieriotin d' notions opposite from the direo--- tions in which thebiideseatend, and adjustable stop arms to vana-ably limit the tentoiangular movement of the blades.

ln an :internati-e damper, the eombins.-

vtion. of a sleeve, a pair oi" damper blades' erases jonrnaled forrotation therein on parallel axes, a lever connected to each blade andprojecting abovev its axis, a stop' arm likewise connected to` eachblade, each blade and its lever and stop arm beingv formed from a singleblank, and a. Weight adjustably cone nested to both of said levers tocounterbalance the eifeetive Weight of the blades throughout Jeheirmovements.

41A. ln an automatic damper, the combina tion of a sleeve, damper bladesjournaled therein, operating levers connected to said blades andextending above the axes thereof in directions opposite from thedirections in which the blades extend, thrust means connected to theblades to prevent movement thereof endwise of their axes, linkseenneeted pivotally to said levers, and a weight suspended ,from both ofthe links.

5. lin an automatic damper, a pair of damper blades, operating leversconnected to said blades and extending therefrom in opposite directions,and counterbalaneing means connected to said levers, suchcounterbalaneing means being capable of adjust nient. lo permit freemovement of said blades upon a slight varianionv in the force ef thedraft passing through the'sleeve.

ln testimony that l elaiin the foregoing as iny own, l have heretoailixed my signature in the presenee nii two Witnessesthis l day ofSept. H908.' i i ARTHUR. SV. ARlslOLl).

ilitn ess-es A. L. MILLER, lif; A. Granneman.-

